A horizontal dilution refrigerator with very high cooling power

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Abstract

A horizontal, high cooling power, dilution refrigerator has been built and tested for studying the feasibility of a spin-frozen, polarized proton target to be used at CERN in the Omega spectrometer. In test conditions the following performance was observed: cooling power 6.3 mW at 0.5 K, 2.3 mW at 0.3 K and 0.19 mW at 0.1 K; cooling time 5 min from 0.5 K to 0.1 K and 20 min from 0.1 K to 0.030 K. The lowest temperature in continuous operation was 22 mK. The refrigerator has a tabular counterflow heat exchanger and two discrete, sintered copper heat exchangers of a new type.

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